• 220-vern.gendns.com ESMTP Exim 4.87 #1 Tue, 26 Jul 2016 12:21:28 -0400
    220-We do not authorize the use of this system to transport unsolicited,
    220 and/or bulk e-mail.
    EHLO localhost
    250-vern.gendns.com Hello vern.gendns.com [206.190.152.46]
    250-SIZE 52428800
    250-8BITMIME
    250-PIPELINING
    250-AUTH PLAIN LOGIN
    250 HELP
    AUTH PLAIN
    334
    AG9mZmljZQAxNzI3eWF0ZXM=
    535 Incorrect authentication data

    https://wordpress.org/plugins/postman-smtp/

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